48 C.F.R. §§ 552.219-70
As prescribed in 519.507, insert the following clause:
Allocation of Orders-Partially Set-Aside Items (SEP 1999)
Where the set-aside portion of an item or group of items is awarded to a Contractor other than the one receiving the award on the corresponding non-set-aside portion, the Government will divide the requirements to be ordered between the two Contractors with the objective of achieving, as nearly as possible, a 50/50 division of the total value of orders placed after the award of the set-aside portion. In no case will this division vary by more than a 60/40 division (with either the non-set-aside or set-aside Contractor receiving the larger portion) from the time of the award of the set-aside portion.
(End of clause)
48 C.F.R. §§552.219-70